Therapeutic-light apparatus



April v28,y 1925.

V. T. JULlN THERAPEUTIC LIGHT APPARATUS Filed Feb. 26, 1923 Patented Apr. 28, 1925.

UNITED STATES VICTOR TEODOR JULIN, OF DJ URSHOLMS-DANDERYD, SWEDEN.

rHEnArnUTrc-LIGHT APPARATUS.

Application led February 26,1923. Serial No. 621,423.

To all whom t may con/0cm."

Be it known that I, Vieron TEopon JULIN, aeitizen of Sweden, residing at Djursholms- Danderyd, Sweden, have invented certain new and useful Improvements in Therapeutic-Light Apparatus, of which the following is a specification.

My invention relates to irradiating apparatus for use in the therapeutical treatment of the human body and its particular object is to increase the efliciency of such apparatus. In treating the human body with electric and other light rays it has proved advantageous to employ mainly rays of a light of a predetermined wave-length, for

4instance violet rays, allotherrays which are more closely related to the red, being screened ofi from the portion of the body affected withthe disease. This has been effected hithertol mostly with the aid of filters capable of absorbing the undesirable rays. However there are rays, such as for instance the ultraeviolet rays, which cannot be separated-'by means of filters inasmuch as filters which allow these rays to pass also afford a free passage for all or nearly all other rays. It has also been proposed to disperse the light by glass tubes filled with water or some other suitable liquid and to collect the refracted rays by plain adjustable mirrors.

In the therapeutic light apparatus according to the present invention dispersing annular prisms are employed which,o wing to their configuration, are capable of not only dispersing but also collecting the isolated rays thus allowing the particular rays to be applied in each individual case to act on the body portion to be treated with an increased density and strength.

. In the drawings affixed to this specification and forming part thereof, a device embodying my invention is illustrated diagrammatically by way ofexample.

y In the drawings- Figure 1 is a side elevation, partly in vertical section; v Figs. 2, 3, l serve to glve a conception of the optical conditions particularized in the following; the prisms are cut in a vertical cross-section.

Figs. 5 and 6 illustrate a detail in crosssection.

Referring to the drawings, there is arranged near the' source of light 1 an annular prism 2 which allows the rays 3 and 4 projected upon it to pass through and disperses them into the several kinds of spectral rays. .The so-called refracting edge of the annular prism is its outer edge line 5 (Figure 2). Of the color components only the violet rays of a predetermined wave length which collect in the oint 6, and the red rays of predetermin wave length which collect in the point 7, are shown for the sake of clearnes's. In reality theapexes of the cones of rays of the other color components and of their transition tints including the ultra rays, lie between the points 6 and'7 as well as outside of the path 6--7.V

Inporder to obtain a still greater intensity of the rays, used for the treatment, several such annular prisms are preferabl provided which are arranged concentrica ly and in staggered relation in such a manner, that the greatest possible quantity of light is thrown upon the prisms and no ray can pass through there between undispersed, as-shown diagrammatically in Figure 3. The secondary refracting surface emergence surfaces) t may be so curved that those rays which are intended for use, such as, for instance the violet rays, are refracted towards the same point 6 of the axis of light or meet at least on a comparatively small surface.

In order to more easily attain the purpose in view, the annular prisms may be axially adjustable as' shown in Fig. 1, whereby it is rendered possible to vary the angle of incidence of the rays on the first refracting surface and thereby the direction of the emerging colored rays in such a way,ithat, for instance, the violet rays of all the annular. prisms are directed onto the same point 6 of the light axis as shown only for some violet rays in Fig. 3, while the dispersed rays of all other colors are left out.

In `order to allow of projecting rays with one and the same apparatus, upon comparatively small parts of the body, as well as over comparatively large areas or, in other words, of more easily accommodating the diameter of the irradiation surface to the individual case under treatment, I prefer collecting by means of an axially displace; able bi-convex lens 34:' (Figure l) or dispersing by means of a bi-concave lens 35 (Figure 5) the rays directed onto the point 6, according to whether the rays are to be projected upon a smaller or a larger surface.

In cases where no 4such exact regulation is the prisms to be cleaned. Two lugs fixed to The constructional details of the novel ap-' paratus depend upon its purpose for which it is designed. In the form of construction illustrated in Figure 1, the lamp 10 is suspended from a jib 11 vertically adjustable on a standard 12. The lamp casing substantially consists of a shade 13 open on its lower side and surrounding the source of light 1 which may be an arc lamp, an electric incandescent lamp or the like and the dispersing prisms 2, 2 and the means for adjusting them. The shade 13 has an aperture closed by a cover, the inside of the shade and the shade carry sheaves 16 over which pass cords 17 carrying each at one end a counterweight 29 guided in a tube 27, and at the other end a bowl shaped disk 19 having a central aperture 18.

'Ihe outer annular prism 2 is fixed in a ring 21 having'as external screw-thread engaging an internally screw-threaded portion of the shade 13. The combined middle and central prisms 2 are cast integral and are supported by a set screw 22 extending through the hub 23 of a spider 24 attached to the shade. The square lower end of the screw 22 allows of applying a wrench or the like. The disk 19 is aiixed to the lower ends of the tubes 27 which are guided in lateral eyes 28 of the shade 13. The depressed central part of the disk 19 has the form of an inverted hollow truncated cone, the shape of which corresponds to the light cone. The

central aperture is closed by a dish-shaped member 32 having a central aperture 31 which may contain either a collecting lens 34 (Fig. 1) or a dispersing lens 35 (Fig. 5). The permeability of the prisms for the particular rays employed in each individual case may be increased by employing prisms made of predetermined kinds 4of glass or of quartz, or other suitable material. o

Apart from therapeutical purposes the novel apparatus may be used also for other purposes, such, for instance, as the ascertaining of the properties ,of the various kinds of colored rays inasmuch as a greater density and intensity of the individual colored rays can be obtained therewith.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

I claim:

1. Apparatus for decomposing light and applying selected rays thereof comprising a source of light, a light dispersing annular prism capable of collecting the refracted rays of equal color substantially to the same point, and a disc with a central opening adjustable with regard to said prism in such manner that only the refracted rays of the color to be applied meet the central opening of the disc.

2. Apparatus for decomposing light and applying selected rays thereof comprising a source of light, a plurality of concentric light dispersing annular prisms separately adjustable with regard to said source-of light and capable of collecting the refracted rays of equal color substantially to the same point and'. a disc with a central opening adjustable with regard to said prisms in such manner that only the refracted rays of the color to be applied meet the central opening of the disc.

3. Apparatus for decomposing light and applying selected rays thereof comprising a vertically adjustable jib, a shade suspended from said jib a source of light in the upper and a plurality of concentric light dispersing annular prisms in the lower part of said shade, a disc with a central opening suspended from and vertically adjustable with regard to said prisms and means for counterbalancing the weight of and for guiding said disc.

4f. Apparatus for decomposing light and applying selected rays thereof comprising a vertically adjustable jib, a shade suspended from said jib, a source of light in the upper and a plurality of concentric light dis-.5 persing annular prisms in the lower part of said shade, a disc with a central lopening ing annular prisms in the lower part of said shade an annular support adjustably connected with the inner wall of said shade and carrying the outer prism, a spider extending across the shade opening and a screw bolt vertically extending through the central ortion of said spider and carrying the lnner prism.

6. Apparatus for decomposing light vand applying selected rays thereof comprising a vertically adjustable jib, a shade suspended from said jib, a source of light in the upper and a plurality of concentric light dispersing annular prisms in the lower part of said shade, a disc with central opening suspended from and vertically adjustable with regard to said disc, means for counterbalancing the Weight of and for guiding said disc and a perforated bowl in the openmg of said disc. Y

7. Apparatus for decomposing light and applying selected rays thereof comprising a vertically adjustable jib, a shade suspended from said jib, a Source of light in the upper and a plurality of concentric light dispersing annular prisms in the lower part of said shade, a dlsc W1tl1 central openmg suspended from and vertically adjustable With regard to said disc, means for counterbalancing the weight of and for guiding said disc, a perforated bowl in the opening of 10 said disc and a lens in the perforation of said bowl capable of varying the area irradiated by the rays emerging from said prisms. In testimony whereof I ax my signature.

VICTOR TEoDoR JULIN. 

